Which statement is true about blood alcohol concentration?
blood alcohol concentration is affected by factors such as body size and gender.
drinking coffee and exercising will lower your blood alcohol concentration.

Well both of theese dont make sense so i reasearched your question and found theese 3 options
:A.Blood alcohol concentration is affected by factors such as body size and gender.
B.Drinking coffee and exercising will lower your blood alcohol concentration.
C.The higher the blood alcohol concentration, the more severe the hangover will be. 

So im guessing C. if this in your question :)

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Ithink it’s d. that should be correct.